ISO 9421 says that the usability of something should be measured in terms of it's effectiveness, efficiency and satisfaction.
在ISO 9421里提到，某一事物的可用性应当可以以效力(effectiveness)、效率(efficiency)和满意度(satisfaction)三个维度来进行衡量。
Properly insulating your attic and sealing any leaks under doors or around windows, will greatly improve the effectiveness & efficiency of your both cooling AND heating systems.
将顶层阁楼与下面的房子进行隔热，将门窗漏风处都堵好，如果这些措施得当，将会大大地提高空调制冷与制热系统的工作效率。
The ISO 9241 standard defines website usability as the “effectiveness, efficiency and satisfaction with which specified users achieve specified goals in particular environments.
ISO 9241标准中对网站可用性的定义是：特定用户在特定环境下，能够快速、有效且满意地完成特定的目标。
The requirements can be related to any aspect such as effectiveness, efficiency or traceability.
要求可以是有关任何方面的，如有效性、效率或可追溯性。
The ISO 9241 standard defines website usability as the "effectiveness, efficiency and satisfaction with which specified users achieve specified goals in particular environments."
ISO 9241标准中对网站可用性的定义是：特定用户在特定环境下，能够快速、有效且满意地完成特定的目标。
The ISO 9241 standard defines website usability as the "effectiveness, efficiency and satisfaction with which specified users achieve specified goals in particular environments."
ISO 9241标准中对网站可用性的定义是：特定用户在特定环境下，能够快速、有效且满意地完成特定的目标。
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